30666740 has 72 divisors (see below), whose sum is σ = 71695008. Its totient is φ = 11007360.

The previous prime is 30666739. The next prime is 30666743. The reversal of 30666740 is 4766603.

It is a junction number, because it is equal to n+sod(n) for n = 30666697 and 30666706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30666743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145235 + ... + 145445.

It is an arithmetic number, because the mean of its divisors is an integer number (995764).

Almost surely, 2^30666740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30666740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35847504).

30666740 is an abundant number, since it is smaller than the sum of its proper divisors (41028268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30666740 is a wasteful number, since it uses less digits than its factorization.

30666740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 30666740 is about 5537.7558631633. The cubic root of 30666740 is about 313.0083119324.

The spelling of 30666740 in words is "thirty million, six hundred sixty-six thousand, seven hundred forty".